<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
      @click-left="$router.go(-1)"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="isLoading" class="loading-wrap">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="articles.aut_name" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ articles.title }}</h1>
        <!-- /文章标题 -->
        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="articles.aut_photo"
          />
          <div slot="title" class="user-name">{{ articles.aut_name }}</div>
          <div slot="label" class="publish-date">
            {{ articles.pubdate | relativeTime }}
          </div>
          <!-- <followUser
            :isFollow="articles.is_followed"
            :userId="articles.aut_id"
            @update-is_followed="articles.is_followed = $event"
          /> -->
          <followUser
            :userId="articles.aut_id"
            v-model="articles.is_followed"
          />
          <!-- <van-button round v-if="articles.is_followed" @click="handerFllow"
            >已关注</van-button
          >
          <van-button round v-else type="info" @click="handerFllow"
            >关注</van-button
          > -->
          <!-- 关注按钮 -->
          <!-- @update-isFollow="articles.is_followed = $event" -->
          <!-- :is-follow="articles.is_followed" -->
          <!-- 组件之间传递数据并且修改值通过v-model -->
          <!-- v-model 中有：value 和 input事件 两个属性  通过传递两个属性   子组件通过$emit来传递事件并修改值 -->
          <!-- 如果一个组件要传多个值 可以通过.sync来修饰 -->
          <!-- /用户信息 -->
        </van-cell>
        <!-- 文章内容 -->
        <div
          class="article-content markdown-body"
          ref="articleContent"
          v-html="articles.content"
        ></div>
        <van-divider>正文结束</van-divider>
        <!-- 评论列表 -->
        <CommentList
          :artId="articles.art_id"
          @event-name="totalCount = $event.total_count"
        />
        <!-- 底部区域 -->
        <div class="article-bottom">
          <!-- 评论 -->
          <van-button
            class="comment-btn"
            type="default"
            round
            size="small"
            @click="show = true"
            >写评论</van-button
          >
          <van-icon name="comment-o" :info="totalCount" color="#777" />
          <!-- 收藏组件 -->
          <!-- <van-icon name="like-o" color="#ccc"></van-icon>
           -->
          <collectArticle v-model="articles.is_collected" />
          <!-- 文章点赞 -->
          <van-icon name="good-job-o" color="#ccc"></van-icon>
          <van-icon name="share" color="#ccc"></van-icon>
        </div>
        <!-- /底部区域 -->
        <!-- 弹出层 -->
        <van-popup v-model="show" position="top" :style="{ height: '80%' }">
          <commentPost />
        </van-popup>
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div v-else-if="errState === 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button @click="loadArticlebyId" class="retry-btn"
          >点击重试</van-button
        >
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>
  </div>
</template>

<script>
import { getArticlebyID } from '../../api/article'
import { ImagePreview } from 'vant'
import collectArticle from '../../components/collect-article/index.vue'
import followUser from '../../components/article-item/follw-user/index.vue'
import CommentList from '../article/component/comment-list.vue'
import commentPost from '../article/component/comment-post.vue'
export default {
  name: 'articleIndex',

  data() {
    return {
      articles: {},
      // 是否显示加载
      isLoading: true,
      errState: 0,
      totalCount: 0,
      show: false
    }
  },
  components: {
    followUser,
    collectArticle,
    CommentList,
    commentPost
  },
  props: {
    //接受路由参数
    articleID: {
      type: [Number, String],
      require: true
    }
  },
  created() {
    this.loadArticlebyId()
  },
  mounted() {
  },

  methods: {
    async loadArticlebyId() {
      this.isLoading = true
      try {
        const { data } = await getArticlebyID(this.articleID)
        console.log(data)
        this.articles = data.data
        setTimeout(() => {
          this.imgpreview()
        }, 0)
        // this.$nextTick(() => {
        //   this.imgpreview()
        // })
      } catch (error) {
        if (error.response.status === 404) {
          this.errState = 404
        }
      }
      this.isLoading = false
    },
    imgpreview() {
      // 得到所有的img节点
      const articleContent = this.$refs.articleContent
      const imgs = articleContent.querySelectorAll('img')
      const images = []
      imgs.forEach((img, index) => {
        images.push(img.src)
        console.log(images)
        img.onclick = () => {
          ImagePreview({
            // 预览的图片地址数组
            images,
            //图片下标
            startPosition: index,
          });
        }
      })
    }
  }
};
</script>

<style scoped lang="less">
@import './github-markdown.css';
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
